https://api.elsevier.com/content/article/pii/S0264410X16306752doi:10.1016/j.vaccine.2016.08.0181-s2.0-S0264410X1630675210.1016/j.vaccine.2016.08.018S0264-410X(16)30675-2Development and approval of live attenuated influenza vaccines based on Russian master donor viruses: Process challenges and success stories VaccineJournal0264410X2016-10-2626 October 20161trueFullfalseElsevierWaivedhttp://creativecommons.org/licenses/by/4.0/